Question: What was the population of Fortaleza in 1991?
Paraphrase: What was Fortaleza's population in 1991?
SPARQL (Wikidata): SELECT ?obj WHERE { wd:Q43463 p:P1082 ?s . ?s ps:P1082 ?obj . ?s pq:P585 ?x filter(contains(YEAR(?x),'1991')) }